OMAP2/3 PM: Adding powerdomain APIs for reading the next logic and mem state

This patch adds APIs pwrdm_read_logic_retst and
pwrdm_read_mem_retst for reading the next programmed
logic and memory state a powerdomain is to hit in event
of the next power domain state being retention.
These are needed for OSWR support.

Signed-off-by: Thara Gopinath <thara@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 73 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index dc03289d5dea..e9eeaa4fbd47 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -679,6 +679,29 @@ int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
 }
 
 /**
+ * pwrdm_read_logic_retst - get next powerdomain logic power state
+ * @pwrdm: struct powerdomain * to get next logic power state
+ *
+ * Return the powerdomain pwrdm's logic power state.  Returns -EINVAL
+ * if the powerdomain pointer is null or returns the next logic
+ * power state upon success.
+ */
+int pwrdm_read_logic_retst(struct powerdomain *pwrdm)
+{
+        if (!pwrdm)
+                return -EINVAL;
+
+        /*
+         * The register bit names below may not correspond to the
+         * actual names of the bits in each powerdomain's register,
+         * but the type of value returned is the same for each
+         * powerdomain.
+         */
+        return prm_read_mod_bits_shift(pwrdm->prcm_offs, pwrstctrl_reg_offs,
+                                        OMAP3430_LOGICSTATEST);
+}
+
+/**
  * pwrdm_read_mem_pwrst - get current memory bank power state
  * @pwrdm: struct powerdomain * to get current memory bank power state
  * @bank: memory bank number (0-3)
@@ -785,6 +808,56 @@ int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 }
 
 /**
+ * pwrdm_read_mem_retst - get next memory bank power state
+ * @pwrdm: struct powerdomain * to get mext memory bank power state
+ * @bank: memory bank number (0-3)
+ *
+ * Return the powerdomain pwrdm's next memory power state for bank
+ * x.  Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
+ * the target memory bank does not exist or is not controllable, or
+ * returns the next memory power state upon success.
+ */
+int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
+{
+        u32 m;
+
+        if (!pwrdm)
+                return -EINVAL;
+
+        if (pwrdm->banks < (bank + 1))
+                return -EEXIST;
+
+        /*
+         * The register bit names below may not correspond to the
+         * actual names of the bits in each powerdomain's register,
+         * but the type of value returned is the same for each
+         * powerdomain.
+         */
+        switch (bank) {
+        case 0:
+                m = OMAP_MEM0_RETSTATE_MASK;
+                break;
+        case 1:
+                m = OMAP_MEM1_RETSTATE_MASK;
+                break;
+        case 2:
+                m = OMAP_MEM2_RETSTATE_MASK;
+                break;
+        case 3:
+                m = OMAP_MEM3_RETSTATE_MASK;
+                break;
+        case 4:
+                m = OMAP_MEM4_RETSTATE_MASK;
+        default:
+                WARN_ON(1); /* should never happen */
+                return -EEXIST;
+        }
+
+        return prm_read_mod_bits_shift(pwrdm->prcm_offs,
+                                        pwrstctrl_reg_offs, m);
+}
+
+/**
  * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
  * @pwrdm: struct powerdomain * to clear
  *